#include <stdio.h>
#include <math.h>
main()
{
    double y;
    int x,m;
    for (y=10; y>=-10; y--)
    {
        m = 2.5 * sqrt(100-y*y);
        for(x=1; x<30-m; x++) printf(" ");
        printf("*");
        for (; x<30+m; x++) printf(" ");
        printf(" * \n");
    }
}